Telephone system



May 27, 1930. s. KINER TELEPHONE SYSTEM Fiied May 25, 192a r w 1 l I kiixiiing qlaxm eg, "IIILi AssIGNon SUP??? m-me mm 14M 15 "A QRRQ M Q fiQIS' systems in which manual "link or cordcircult's' are provided for interconnecting telephone cord 'circuits of the "feature type? in" which means re provided for interconnecting-i com-,1 mon battery substations/oi? commoii battery and magneto substations as ca-l'lingjand called 1 lines." i In acoiiimoii batteryv exchange 'systemflof the single ofiice typein addition to ,the'-cOm-' inon battery subscribers? lines;whichgteif i-" nete at the locstl;.positionsgofjfthe exchzinge; a switchboard the, same m y {be equipped with a, toolor rumLp'osition at 'WhiChLthej wri' r al oi' toll lines terminate and Which is 'u'sed 'fob extending connections to "the oiitlying or; rur elflsection of thefcommu'nity whichsubflstations may be of the'l jriagii eto type; An" i operator handling a; connection between: common --betteryi"line aindfa' tolL line" extends the connection over a trunk j circuit: to the op; 5 orator the: rural 01": tollti po's'it'ion of: the U eXch'en 'e switchboaidand. this toll} operator k inturn completes theconnection-byconnect ing ejplugendedtrunkcircuit With the'Wanted tollline of the rural'spb'scriber: "This type of system in: addition to the usualjappe atus two operators for, theijcompletioil of 1 inaction ofthis'kindgr-if 40v 'scribe fs terminating "at {thedifierenti loczil positions of the exchange- Witchboa -d,:t11e j cordmay -beused forextending c from a calling commonqbattery directly we called rural} oi'zm agiietosubsta tiofi i' which 'tterminateskgat ithef ri rel 'itoll fio i poeitioniofthe exchange switchboerdi i" r tiples of these Y rural lines that terminate, at

"thereat is eqiiipped with the imlti'ples of thel common batterylocal line's terminating zit the local positionsvlandiby means of a universalv art connections from acelling ruralline'meyi beexte id'ed toe local 'common battery, called r'ui'al position.

tion cor d' cii'cuit forefl'ecting the above noted 1 featu e ofiny ini ent oflneans in a combinationcord circuit which at theflocel and toll positions Tis'f' eqiii'pped with trunk lines"v and; order; lwire'S @foi pur} v po'ses ivfillunderstood andfcellls from com- I monk battery{isubscribe sijliiies; terminating v. at the local positions of-the exchange switch? board t mag rura il l s terminating; .at

' the rum position [of the exchange} switche I board are h i d'by hwl cal o f'a or and 1 the rural o toll 'op'ereton thusnecessitating ".opemtors set f in circuit" to" supervise" a co 0}} I fleet-ion between a commonfbattery end e I i riiral liiie erid 'ini which" when the lcallin iTQIObYlELtQthQnecessltyflqf"tWOOPGIELtQI'Sf g ,Iid semea i t e-form 0e mbine i mg I cordcirciiitwherebyjin a d difc lorlitocomplet-' ing;connectionsfbetween common battery; subconnection substation;

To; accomplieh this direct connection ofe;

i commonvbzittery callihg subscriber to "a nag.-

neto rural called 1ine,.therura1 :1ines ter'ini-j neting et the. t01l position of the exchan'gei switchboard are multipled inthe diflerent 55; T 1 localpositionsofthe, exchangefswitchbozii'dj 7:" so that any of the'opemtors, at the different; local positions-mayplug'into one of the mu1= the rural position and coiinect a calling com. H1011 batteryisubstetion to 9, called 'r'niigrietor, 'siibstation; :The {rural ipos'ition softhe eX.-.,

"chahgegswitcliboardin edditionitolthe Iiiag;

neto eqi ippedsmiiial linesj Which terminate cord circuit which i jWell understood in) the line"throughfla"multiple; appeeringf at. 131165- l 5 ent invention is" the'jI Q One objctiof the j pie provision o fla newend'impi ovedcombine-1,; i

typeso-fconnectionsn ion is theprovisiong provides automatic listeningeutomatic ring feeturesfwhich are Well known, 'Whenf .the it: i

cord is' useddn'establishingconn ectionsjbe j V tween twofloca l comlnonrbatteryjsubscriber j Avfilrtherfeetureof myin e-ntion isthej j, proy-ision'ofmeens in a' combination cord cir-ff cuit lwhereby the operator may connectfthe c'ommonbatte y subscriber wi she s toireca l N V the operator one connection of this 'kii dgthe H 1 festorzitio ri ofthe receiver at the 'czillirige t'aition the removal ofthe same to 1 .7 tiatefa recall'caiiges means in the cordicifc'uitfg to operate tofizishth'e answering supervisory i I I lemp'o fthe'cor dto attifzic'ttl e opeitotat-Q 1 tentioiilj; o

alienate.mama rim? iightluimulti hase- I i lamps S at ap lurality of"operatorsipositions.

disconnect relay LD,.icond-uctorgi.

contact '8fioff the relay :9;ecndu ctr slOg' sleeve contacts otth'e'plug-AP and jaCkjJ to ground "through the' Winding oflrel'ay C Q. E'Ehe relays LD and C0 are. energized Over this cir feuit and the closingof alternatecontaet 11' of.

- Tr'elayf L D closes aj 'low" resistance circuit 1, j

through itsiwinclingtraced from" battery through the Winding 5,ialternatecontact'lrito' @rounclthrough cut, ofirelay. CO "over the 7 previously cleseribecljp'a'thv- Relay CO upon energizingopehs its'noi mal icontacts' 2am 3 to cleenergize relay LR and the relay LR up i on cleenergiz in'g brings aboutthe efialcement 1 of the multiple linegsignals The high iresistancewinding 6 of relay is'shunt'ed and f this arrangement provides *secret's'ervitze, as

' the link disconnect relay LD. of aseconclcorcl will notoperate inserieswithfthe relay CfO as 5ft! theshunt of the flowf'winding .5 ofthe relay 'LD of the first cord as Cs- Tenders the relay L DZ of the second,cordinoperative.sothat shouldtheoperatorat anyfother position attempt to. seize the call afterf' the operator" as sociated with cord C has 'connectedyto the-call- "inglinejthe operatorfof thejseconcl cord is prevented from-connecting with the-- calling subscriber as 'theshunt of the "low of the'relay LD of thecorcl C preyehts the g F relay-LDoi the seconcl corclfrorn operating,

Mat is prevents the" operato of the/second I I, g cord from being connected to'thecoallingilinel The relay LD energizingqiit contacts '12,-

13, 1 lanfl 1,5. are inovecl toitheirf alternate' and 513 completes, air energizing circuit for the answerln'g superv sory relay AS ftraced i from batterylthroughftheflower wingling of relay1AS,-the;winding "b coil iPtQyalternate"contao v I p eringfcontactsof the plug uAP 1 and'jackJ,

of the repeating through the closed" contacts loft the substation s itchhoolgthetip contacts'ofthe connected jack Jana plugjAP alternate contact 12 of 'l L relay'LD,'Wincling a oftherepeatingjcoil 11C to groundthroug'h the upperwinding of i f jrelay. 1" The closing of alternate" contact }15 :of relay L1): establishes an energizing cir cuit for relay 1? traced from battery through 1 winding0'1 relay- 17, conductor 18-'to ground l. at; Ialternate'contact l 15 oilrela LD fon'p'urf poses whichwi-ll presently:be' clescribeclv{The relay AS "energizing, its contacts 19ffantlg20- aremovecl to their'alternatepositions; i The closing-of. alternate contact 19 0f relaygAs traced from' battery through the Winding of 'in'gcircuit" =,tor-. the meter magnet Mltracedif' from battery throughthe windihg'o fjmagnet lvl' concluctor 40, alternate contact of re- 'layORQcOn'cluctGr 3l-togrouncljat norrnal :3

;scribe'rat' the substation a ,7 I .7 i A suln'ing thatthe subscriber atfthe com-.

tater-tests the called line as toits 'icl'lelor busy I 50011ditionfiri'ltheusualrnann'er by placing the positions- Closing jof alternate contacts 12= the cor d G-ftracecl 'rr m batterythroughgthe;

-3 of relay LD;

' groundthr'ough windingof relay COCf. The I relays COQ and ESL and SL are? energized} overthis'circuit and the relay sLei le'rgizing;

I conductor to grounclfat alternate contact 1 V 44 ofrela SL; Relay .33 energizing its coning "its alternate contacts 36 andfl 37 discon .7 'nects the operators set from. the scra c establishes" an energizingcircuitforthe aux Q I ilial y ,supervis'ory' relay" {ASE '7 traced from l I batterythrough"theinding of re1ayAsR,w conductorfll to ground at alternate fcontact 19 o'frelay ASJ: The relay"ASE-energizing, its contacts 22, :23, 2 k 1. and 25 g are moved" toff if theirI alternatepositions; ,The-closing; of alternate contact 23, establishes an energizing] "circuitforthe 'ope r atorslisteningrelayf OR* tracediffmnbattery; through thewinding of relay Oli lconthlictor 26', alternatej contact 23- of relay 'A'SR, conductor v27;. normal contact '28 of the listeningkey LKiconcluctor 29, al .5 l

ternatecOntact30 0f relay 1-7, conduction s r to ground at; normal 'contac'ti32 of relay 33; r V Therelay QR-energiZing its contacts 35, 3'6; e

37 ancl 38 arednoved to their'alternate?iposi "tionsancl the closing'of alternate contact3-8; 1

establishes-a locking circuit forthe' relay OR, p J relay OR'ancl its'alternate contact 38', con-. ductors39fancl 27, throughnormal-contact 28 of theilistening-key'LK to ground' at nor- 7, 111211 Contact 32 of relay 33 over the previous-f; 1y described path: The'cl'osing of 'alternatefmi "i;

contact 35 of relay ORfesta'blishes an energizcontactofrelayu33 Theclosingiofalaf g t ternatecohtacts 36 and 37 of relayOR'IcO-II-J; s

"nects the operators'set Oto the tip andiring'f concluctorsgofthe 'cord -Chn'cl. the operator; I A inaynowinquire the Wants of the cajllingsubmonbattery'substation D iswantedthe'open ti'pjof the plug GP to'the sleeveofthe jack J I oftheficalled line! Assumingthattheline isf I idle the operator inserts the calling plug-GP intothe jack J. ofthe called line thusc'losing -an energiz'ing'circuit for the'cutofii elayCOf- I? 4 of the line circuitL" associateclwi'ththecalled V line Dv'anclit he slee'xl e' relaysfsL and of- Winding of relay SLflcnduCtOlAZythe wind I ing. of relaySL',concluctorjl3,-s1eevecontacts 1 of the connecteol plug GP ancl? jack 1.J to

closesi its alternate contact to establish an energizing-circuit for the-relay. 33 traced from battery through the Wiriclingof relay33,

tacts' LSA ,32and 48 are moveclto-their a'lter j 1 nate positions; The'openingfof normal con V tact 32 of relay 33' opens the-locking'circuit ofrelay OR Which deenergize'sandby o e h V ccrcl Clvthrough thelyvinding .ct'ofgthe-rev peatingcoilRG, conductor v87, alternate contact gofrelay SL", totgrounol through the I upper winding of relay 0S} flThis ringing tone is in duce clin the winding a? of the refpeatin ccil RC from which it extends to the Cel i" tub ta nfi it g t ei u f crib r thereat'an audible .ringingsignali I j'Shculcl the [calling subscriberat i staticn Areplace hi'sreceiver'uponthe switch V hock beforev V th e called subscriber at "the, "substation- D, I answers, he Will bring about the uit of relay 58. Therelay -ASR' cle'energiz 1 ing, itsjalternatecontact;25 is again cpenedl "to interrupt the locking circuit through the ringing control relay ROB -1 The relay'RCR Vcleenergizing, its alternatec0ntact61 is again opened to diseonnect-the interrupterl from the ringing interrupter relay RI and the relay "RI '1"10 -w remains cleenergized' toj prevent "further apphcationOf ringing current tegthe' called. line D. The closing- ,Qfnornral centact'bfiofrelayfRGB again closesya circuitf;

fcr the calling 'supervisoryglampGL to {light the; same a and the clcsing'pf :ncrmal:ccntacts 88 and 14: or the respeetivefrelays 58 "(and .close, a circuit foifthe; answering supervisory lanip vAL traced from batterylthro'ugh the ,853'through the Windinge a c l B' gn' me-l"wn aft8150f f lt? I; rin i ecntac'ts.otfthewcnnecteel plugjGPiancljack is r sterout ges: i the "back through;

* a i e rsupervisory signalsAL anclyCL withdraws 1 I, lamp AL, normal contact 88 cf relay 68 ccn- -cluctcr 90;, normal contact 'llcf relayLD, and "conductor to grc'u'nd fat alternate {contact 32 ofrelay 33. ilhelcperator noting the "two lighte cl signals ,AL' ancli CL may} now withclrawthe plugs AP an'cl-GB fronrthe respectiyejacks J ariplJ to restorefthej appa-' ratus' to' normal as 'willihe nicre fully here in'a'fterdescribeil ;Assuming;that;the. 'ca'lled subscriber; in response to the call Isig l lalffilenicves.hisji e ceiver frbrn-the switchhc'o'kWhenithe ringing interrupterrelay BIis 'inga deenergizecl con; 7 l1. 'ehticn "which is cluringithegsilent period; the" v callingsupervisory relayjCS Willhe energized g over, a cireuit'tracecl from battery@-thr0ugh 1 I the lowe Windi g 0f 7 alternateContact; 1301 switchhcck'at the-s rent toithe'callecl line;D,-' The subscriher's' A "circuit he traceclctter. the heayily marked: 7 a conductors;

D having finished their ccnversation replaee ofthe relay ASand the relay AS in-turn" at Y 7 [the- 'l nd relay CD of the line tcircuit a 5:

stcres'; .The r'eplacin ofthereceiverat ffs uperyisory lamp CL to light as previously "Should the gcalling subscriber gat the sub-J a; station A Wish tc recall 'hefore'th'e plugsAP: I, I and .CP are reinorfetl-irom their respective} acks J and J, therernoyal ofthe receiver at gi za'tion effthe line L relay LR *of V the. line ici-liw Sand anyone o faiplurality ofoperatcrs may 1 seizethe recall to the exclusion of the others 3 orfthes'aineOperator:who handledv thegeriginal' connection may. seize the recall; gbyi re rncvingfthe ealling plugOP froin the ijack 7 f t efc'all l D- h movali h. fip'l'ug GP; frcmj the'ij' aek. J'f'bringsf about th cleenergization jcf the relaysSL andSL. and, the relay restoring allcwsfre'lay' 33 "to', re astereanelthe restoraticn" bf ,Ielay ISL: allows 11 mm contact' 8 :is again cl0's'ed"i't 'hrjn i layGS ,fecntluet r;91 aboutrthe 'nerg'iza'ticnfif the relay-L1) epera o'n i 15 to lconneetfthe' operators set tof'th f conducterslin answering "this lre'cal Referring againfitc: the iilisconnecticno, eordf frOmQthe-CalIiDg j and ,c'all'e clline id scen ects the ,an wermgmt 0t jing interrupte-r I fromtherelayBI thus pre- ,i i venting furtherapplicationofringingpurf; 5

and ,D are i'wvv;ccn neetecl and-ithevtalking fs Thesubscribers at i I their'freceiyers upon their respective switch-1 6 hooks.The"lreplacim .ofthe receiveratithe; j substaticn' A brings 'a hout the deenergizatlon' its alternate contact 19 interrupts the jener if gizing'circuit o'frelay ASE. The relay AS3 5 .f -f deenergizing its alternate Contact 24; is again 7 z opened to interrupt thelocking cireuit cf the h i Ii link'disccnnect-relay LDend relay LD-- Of L cleenergize and the relay restoring ,alsg '1 pens .theeireuitofthe relay I58 Whichjre 'substationD'brings a outthedeenergization of the relay CS. 5 The relays 5 8 'and'L'D reg storing" cause the answering supervisory- 19,5 lamp to light as previously described and the relay CS restoring causes/the calling i I described.

the suhstaticn A Will'brin'giabeuttheener- 7 i cuit Ll-stc'agaln hght the;mu1t1p1e linelarnps. i

the ansWering-end cf ith me as fpreyi cusly "described;

and" 1), the ,ep erator noting' thej two lighted p s f mthete p ir i k 11 elngyal' off'thejplug APfro'" 3 p vg my l piet;

' ferator at the siibs tation'f ifihef "lr l y' 7 1'5 which pl'ace's him in a" conversationalcircuit with-the celhng suhsc 'lhenetfA over the fheayily markedfeoncluctors I Theopei'zttor 1 nowl-rj sto'resthe listening key'lJK' to openits v alternate Contact 28;;to' intei ifn'pt the circu t ovof relay -\vhich;noiy restores 'ztnchtliscoH-f v nects the opei'etol s set Q'fronithecord ,Coil

I dtietofs; I o V "The subscrlber's havi 'Versatmn replecethelr reoewefs; 011111811 re- 15 spectivej switchhooksil The replacing of the 7 receiver ait'the 'calling suhstationA, brings about the "deenergiizzition off-the relay AS."

1 Relay "AS in 'tu'rn'flopens. the energizing cii chit :offithe'relay Whioh tleenergizes' to 720' open the -energi'zingcircuit 0ffthe-reley58 but the: f relay" -58 being=;sloW "to; lfeleas'e is} held momentarily"energizedtoblose@Qnenergizing 1 circuit. 'for the relay 110 ,traeed from battery;

. through thewindingofrelay"110; its nor1nel 25 7 89] of Trelay E58 norniztl j'contaet 'offreley A'SR;"c0noductor 59, alternate?Contact 114 501 rela'y LDjand conductor eotegroundret he ternatefcontact 32 offeley'38; The' iel'ayllO energizing its make 1-' before {break contact 114; closes" a [locking eireeieer its 1f traced from battery through: the Winding of relay 110, its meke before jhreakf contee't 11 1,0011 Y doctor 115', norma lfcont ajct 116' o'fthe listen of normal ontact 22 of relay ASRL} The re I lay LD does not deenetgize when? the subseriheret the station vA- replece's his"-ieceiyer'r d uejto the deenergizationefieleyASR as is the-case on a common battery to eonj inen ba te y o d io ias re y-91 l 1 7 through the normal Contact "89 of rele-y 9 as throughtheila-rnp A ,5 I u to 05211031 211 Contact 89201: nelayzssi ton-[ t i megawat 1 1 tm-;' 32 01 relay 33, "The suhs fib etthe called ma 1 net! s 'bst atiot E after; replacing liisjreceiy upon'theswitehhookopemtes theehzin gen t; of

RC, tonne-tee? epe t ns co' i x .7 v

' SL1 conclneto from battery through the lower winding of v relay GS, conductor-9l, normal contact 51 of g" finished their oon-- contact 112', conductor l-l3 ,falt ern'ate Contact of "releyYSL;v conductor 130; normal Contact ARto ground at cuit. Thelightedsignels AL ancl'CL'give ing key"LK;-c0ncluctors 7 Ethel 59; altei nete Cohtact'lahd conclhctor 60 to gfou nlcllat altrIit 50 032} f l' '33'ltl ""Cl'lt' ,1 V. V e a 6 Con a 0 re ay epen 'nowremoye the plugsAP endgp f 1 I g respective jacks J enclJ r l y ig idid 16? fi rgize' fie thg afli again'hrings about the energizatieh of the re-' 1 end of the-cord C wgts-connectedtothe eallecl o I: megneto line. fThe relay"figtleenergizing,its-

' I nojfmalgconteets.88Tancl189 are closed to lit 'the ailsweiih S11 v V V v g swei ngisupervisory s gnal ALhut-gthe 'closg closes, a substitute ellfci'nt' for th'e 'lztinp AL" tently'lightechahcl'eifaeecltogiyeythefopere v tore, flashing ,signelqvhich inclicateslto "hen contact i62-0f relay 'RQfljconductor 1'19,- through-"thewinding of the relay- Afigcony V cluetors 120 and 85, inding d ofthe repeat- 7 ing coil RQfnormel Contact 81' of relay RI; ring contacts of theplug CPend jsick J? back to 't'h'e hand geneljatonat theasubstation I Theirelay AB is energized by the current from the generator and; closing itselternete contact 121 establishes an energizingcircuit for the calling superyisoi y' relay CS traced relaySL, conductor 122'," the resistance 12f3,- conductor 124 normal contact' 125 of the v n listening key LK, conductor 126,- alternate Q COIltELCt 2180f relay 33 anclconduCtor '127 t0' ground zitalternate Contact 121 of relay ARt Ti 7 The relay CS upon'energizing closes a look i 1; ing circuit for itself 1' traced from hattei y' 1 through its lower Winding to-ground let its 3 Ialterriatebontact 69 oyer" the previously T de y? scribed path independent Qfthe ground at? alternate contact 121*Whieh is opened it-filerthe celled'subscriber at substation- E hestlis- V continued operating-the hand genei atortherea at. A circuit is also established-for thec'all;

ing. supervisory lamp CL traced from'hafttel y throught the lamp CL,n0rniel eontect"6 5 of; -v

relayRCR, conductor 66; norm l cohtact 19 I ,95 '63 of relay RCR;nonnelicontactlfl of relay alternate eentact 69 of relay 1 5 CS'ancl the lampCL is lightedoverthis cirlssum-ing new. that the subscriber etihe 5 f. ff 'caflhng substat1onA.w1shes-t0 eee'llfbefore.

theplugs AP and GP are removed from the jeeks J.{l;l'l;ClfJ ,1]l1 removal of the receiver at the CQ'll-HIQ CQHHHOII battery substation o T eyes over the line and the itelay ASi'nthr'n closes an' energizingcircuit; fot the relay- 5 8 and the relay 5.8 energizing, its .normzil ]con tects 88 ancl 89,;are opened to efi 'zicethe en-4 ground throng-lithe constantl rotating; terrupter; Ia The larnpALisnowgintemn t elling"st hsoriberet theshbstati'on I A; is sighelli-ngfor a'rec'ztllg QTo oonyersewith Y theireoal'l-ing subscriber gtgsubstetion A the nected substations to give' a disconnect sig-. j

tent operation of. said signal before discon- ,c i nection between acallingfcommon battery nal upon the termination of. conversation between two common battery llne's or acommon batteryjline anda localbattery line, and

means responsive to a subsequent momentary actuation of the hook swltch of a callingsubscriber to automatically cause an intermitline andfacalled local battery line. A

A telephonesystem includinga link'cir- I ,cuit having answering and calling terminals for nterconnectlng two common battery lines .mittent operation of signal to denote a or a common battery line with a local battery line; a signalassociated with saidanswering v end of said cord a link disconnect means for said-answering 'end;'-means operative'inci- "dent to the actuation of the switch at the calling substation upon'thei termination of l'c'onve'rs'ationwbetween a [pair of" common battery linesto 'efl'e'ct saidglink disconnectmeans, to disconnect said cord fr'om said line, to permit a subsequent irecall'by. the 'callmg subscriber,'and meansin said cord effective'upon a connection between a common battery lineanda local battery line to prevent the disconnection of-said cord from saidcall- ;ing line, and means operative upon a subse:

quent' recall by the calling common battery subscriber for causing "an automatic interre'call, r v r a v v v v I 7 In a telephone system,,telephone lines including common'battery, lines and local battery lines, a link circuit 'for'interconnecting two'common battery lines or a calling com- .mon battery line with a-local battery line; a supervisory signalforsaid linkcircuit, means, operative "incident to actuation of the-hook of conversation between a common battery line and a localbatteryline to prevent the operation of said disconnect means and to a cause the operation of said signalin a disv c a j 8. A telephone; system comprising teletinctive manner upon the subsequent recallof said calling common battery line.-

fphone linesof different character including common battery lines and local battery lines, a cord circuit forinterconnectingtwo com-.

mon' battery lines or a I common battery line and local battery line, disconnect'gmeans in said cord for operativelyidisconnecting the answering end ofsaid cord from a calling. 7 common, battery line,, saidfdisconnect means comprising a'relay havinga high and a low n cticn, f isaidfcordf circuit; and sa cal-.

m me 1 1 1.1 61 71 10 6? ys fi comrif" 1 y phone in "ofldifi'er jt cfiaractrfincluding I esmmgn tt'er' li sa'nd lbcal batterylines, Pill cordfc muianavin i an answeringtcrminal V ailing; te 'ina'l, i' or'interqon-i ting" Ocommonbatterv' "'nes'or' a'com teryj lineaiida'local' batte inc, a' 'dis'c'oj I 3? albwre'is'i'st WiH ;i fg}5 1 dfl= 5 high resis i i ,ilf V hi ur i n s Wi in'g closedupon are energizatio' ffsa'id relay to irrel an an th f ch m er" Qi im i li said c g lina elar' o .Pfr ns' e s or t v y .d sconn c i g-"sa d r i n ornjjsaid calling line incident to tlie actu apa r f daem n b e y t leph e frt i 'iho w ystem v, 'li l" 1 -9- 1 i cord circuit h'aving-an answcringterminalland. a*ca l ng'it min i"ii rinterconnec n two"ammwa y.li sior mm 'n ba e "terylineanda loc lbat' 'r yg?@filow v r 31 flgh.lSistanceivili l gi fl d i aeyiQP l igl p'ol th conne t O said fi wer ng' fm nal'toa1callingfcoinmonbatteryline;ashu it is V c uiti orzs h g r stam i d ngidO d' upon-the::energization of said relay, to pre 1 vent anotherbperat0r connecting'to' said call-f 'Q glifi aid r l y. 'QQmP SiDg-m s b ""eraftivel b 'tfWe IlTa alling C monibatfi andiaf call'ed'local'battery line. 11. A; telephone system} comprising phone linesiof different"characterincliiding c mmo ba ery, l n s a d 10m b e y li '11s is if: a cordlcircuitlfor interconnectingtwocom mon battery lin'esior a common batteryline andvalocalbattery. linepa disconnect relay 5' i in saji'd cord circuit having a high resistance I winding and a low resistance'winding, said 120 relay being. energized upon the connection of said cord to a calling commonbattery line, v V

a shunt circuit for said high resistance'winding to preventanotheroperatorconnectinglto1 l I saidc'alling line, said relay upon"energ1zing;;-12 5 1 closing the talking conductors offsaid' cord circuit, and deenergizing' upon theactuation" p of the;hookgswitch atsaid calling j tation thereby reopening said; talking "conductors f and "opclfatively disconnectin'g ai ,0 4122 3 1 i resistan eswil dingand energizing upon the 5 I are t oniorthe hoQksw-itch at theba'llinQstation 1; upon thetermination ofconversationbetween "dire t q r' re m n fe' y s and: ml' t y' ines;i- I i 1' i its a s stance wlndingjand f 1s 'nnectl'ng'sajidcord'c rcuitifroin I den to the a tua 10 of 1 a rminatijon of conversationbetweenlfa nieans forren'dering said disconnect-means. l I 'i [1 ope'iitz ve'upontheterm nation'ofconversa- 1 0;]-

"'liiie- 

